Barrie, Ontario climate data is summarized below. Average annual temperatures range from 2 °C (low) to 12.1 °C (high). Annual precipitation averages 577 Millimeters. Barrie is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.11 °C | -2.82 °C | 5 mm |
| February | -12.2 °C | -3.14 °C | 0 mm |
| March | -6.36 °C | 3.78 °C | 26 mm |
| April | 0.46 °C | 11.56 °C | 41 mm |
| May | 6.54 °C | 19.09 °C | 64 mm |
| June | 11.76 °C | 23.54 °C | 87 mm |
| July | 14.49 °C | 26.09 °C | 106 mm |
| August | 13.85 °C | 25.16 °C | 109 mm |
| September | 9.69 °C | 20.87 °C | 62 mm |
| October | 4.65 °C | 13.79 °C | 40 mm |
| November | -1.23 °C | 7.01 °C | 24 mm |
| December | -6.8 °C | -0.03 °C | 13 mm |
| Annual | 2 °C | 12.1 °C | 577 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |